Oftel Specified Numbering Scheme

Browsable Files Held on this site

Contents

• What is it?
• Presentation of the Data
• The Data
• Details by Operator
• Latest Changes
• Related Information
• Copyright

What is it?

The Oftel Specified Numbering Scheme (SNS) data is issued by Oftel's Numbering Administration Unit as a zip format file called codelist.zip, a copy of which may be obtained, via the network, from Oftel. It contains a number of files which form a database of allocations of telephone codes in the UK Numbering Scheme.

The data is also available from this Web page in a variety of formats more suited to those who wish to browse through the data, or do not wish to unpack and process the Oftel codelist.zip file themselves.

The information below is based on the version made available on 02 October 2006, size 652718 bytes. containing:

         sabc.txt created 15:07 02 Oct 06 size 317060 bytes
       readme.txt created 09:12 12 Sep 06 size 12539 bytes
      s1_code.txt created 15:51 02 Oct 06 size 4352286 bytes
     s1f_code.txt created 15:03 02 Oct 06 size 301307 bytes
      s5_code.txt created 15:03 02 Oct 06 size 44608 bytes
      s7_code.txt created 15:03 02 Oct 06 size 366096 bytes
      s8_code.txt created 15:06 02 Oct 06 size 711803 bytes
     s8f_code.txt created 15:06 02 Oct 06 size 723811 bytes
      s9_code.txt created 15:07 02 Oct 06 size 1714825 bytes
     s10_code.txt created 15:07 02 Oct 06 size 236818 bytes

Presentation of the Data

In order to understand the data, it is useful to view the README.TXT file which Oftel release with each version. It takes some getting used to the way that different parts of the number range are split between different files, with different fields of information. Browsing the different files below may help get to grips with this For a fuller description of the Specified Numbering Scheme, refer to Oftel's Numbering Information, especially the Numbering Conventions document.

The files listed above are made available here in three main formats:

1. csv - as issued by Oftel in comma separated value format, accepted by many PC packages.
2. text - the whole file in plain text format, for easier reading.
3. tables - split into convenient sized tables, suitable for Web browsing.

The affect of that is to multiply by three the selection of files available.

The Data

The files are:

• README

  The `readme' documentation is available as an ordinary text file

• SABC - Codes in the range 1000-2999
  (Mainly Geographic Numbering Range, Covention B3)

  Available as: csv or text or tables

  Note that fuller details are also available, see SABC_DE - Full `DE' digit listings for `S digit 1' list below.

• S5_CODE - The Corporate Numbering Range (Convention B5)

  This range has been designated for Corporate Numbering or Freephone 0500 migration. Corporate number services will be provided from the Scheme, as and when there is demand.

  Available as: csv or text or tables.

• S7_CODE - The "Find me anywhere" Range (Convention B5)

  Services in this range include mobile, personal numbering and paging which do not meet the criteria of other ranges.

  Note: Includes Mobile Ranges, listed under the now defunct S4_CODE prior to July 1997.

  Available as: csv or text or tables.

• S8_CODE - The Special Services Range (Convention B8)

  For services charged at special rates at no higher than the tariff for standard national calls.

  Note: Premium rate services, previously in this section, moved to S9_CODE in July 1997.

  Available as: csv or text or tables

• S9_CODE - The Premium Rate Services Range (Convention B9)

  Services in this range are normally expected to operate on a shared revenue basis between the operators and the service providers.

  Note: Separated off from S8_CODE in July 1997.

  available as: csv or text or tables

• S10_CODE - Access Codes and Short Codes (Convention B11)

  Used for purposes such as operator assistance, contacting emergency services, choosing network or routing, selecting a network service, etc.

  Available as: csv or text or tables

• SABC_DE - Full `DE' digit listings for `S digit 1' list
  (Mainly Geographic Numbering Range, Covention B3)

  Detailed listings of the Area Numbering Range show allocations down to the D and E digit level - the first two digits of a telephone number in an area with a code of 1xxx

  Available as: csv or text or tables

  There is also a summary table of each the SABC ranges, with the numbers of DE blocks of each status, and ranked by the number of free DE blocks in that SABC range.

• SABC_DEF - Ranges with blocks allocated at F digit level

  Exceptionally number ranges are allocated to different operators at the F digit level. This file lists the allocations to individual operators for the codes where this occurs and where the relevant Sn_CODE file will have just noted the operator as "Mixed".

  Available as: csv or text or tables

• SNS_CODE - Code List Abstract

  This is an abstract of the Specified Numbering System list and gives information about all allocated Codes in the SNS. Oftel no longer issue this file since it is possible to create most of it by combining the information in the various of the files above.

  Available as: csv or text or tables

Details by Operator

The data above is also available sorted into entries for each separate operator. This may be a more convenient way to access the data if you are searching for codes allocated to individual operators.

Latest Changes

Each entry in the data supplied by Oftel contains a field which holds the month and year that entry was changed. The data is typically released weekly. To view only the changed entries, consult one of the following sections, sorted by the month in which the change was made:

• Changes made so far in Oct 2006

Copyright

The information is © Crown Copyright and is published as required by the Numbering Conventions. It may be reproduced with due acknowledgement of the source of the information. Request for commercial publication of the lists should be made to HMSO. No responsibility is accepted for any errors which may be introduced as a result of any such reproduction.